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An electric motor is monitered with an ammeter, voltmeter, and wattmeter, which indicate 5.2A, 120V, and 480W, respectively. Assume 60 Hz
a) Draw a phasor diagram of the voltage and current, assuming the voltage at zero phase and lagging current.
b) What is the reactive power to the motor, including the units?
c) To improve the power factor of the motor, a capacitor is hungdirectly across the motor terminals. What value of capacitance willgive unity power factor
A system is needed to measure flow, which continuously cycles between 20 and 30 gal/min with a period of 30 sec. The required output is a voltage varying from -2.5 to +2.5 V for the cycling flow range. The sensor to be used has a transfer function..
Calculate the instantaneous power absorbed by the resistor, the instantaneous power absorbed by the capacitor, the real power absorbed by the resistor, the reactive power delivered by|the capacitor, the load power factor.
A silicon semiconductor at T=300K is homogeneously doped with Nd=5e15 cm^-3 and Na=0. a) determine the thermal equilibrium concentration of free electrons and free holes. B) calculate the drift current density for an applied electric field of E=30..
1-mH inductor carries a current: i(t)=50*t^2*exp(-2*t) inunit of mA. Determine the voltage, power, and energy of the inductor as a function of time.
A process with Gp= 2/(2s+1) and Gd=1/(2s+1) experiences a disturbance step change of magnitude 5. The SP remains constant. If a P-controller alone with Kc=1 is used and Ga=Gs=1, then what is the output variable, delta Y(t) versus time
The lens-makers' equation applies to a lens immersed in a liquid if n in the equation is replaced by n2/n1. Here n2 refers to the index of refraction of the lens material and n1 is that of the medium surrounding the lens.
Discuss the major difference(s) in operational characteristics for latches vs. flip-flops: compare the timing diagrams for the D latch and D-type positive-edge triggered flip-flop.
Sketch the equivalent circuit and phasor diagram for the no-load conditions and, assuming operation is in the step down mode, determine (a)the exciting current; (b)the core loss component of the exciting current; (c)the magnetizing current; (d)the..
Explain why a voltage follower implemented with an op-amp is a useful circuit component. Explain how the nature of KCL allows the connection to a single op-amp input of multiple voltage signals, each through a resistor, to perform a summing functi..
The following functions describe the oscillations in electric circuits and the vibrations of machines and structures. Plot these functions on the same plot. Because they are similar decide how best to plot and label them to avoid confusion.
A transformer has a primary voltage of 115v and a secondary voltage of 24v. If the number of turns in the primary is 345, how many turns are in the secondary?
For the closed-loop system with plant model and controller given by G(s) = (s2+81)/(s2(s2 + 100)) D(s) = (K (S+1))/(S+13) (a) Find the locus of the closed-loop roots (poles) with respect to K;
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